Pump



R. H. STOKER.

PUMP.

APPLICATION FILED MAR. 2 2, I921.

Patented Dec. 6, 1921.

4 SHEETS-"SHEET 1- INVENTOR fob? 17. jidfer WITNESS R. H. STOKER.

PUMP.

. APPLICATION FILED MAR. 22. I92].

1 mm z 0 M M n Mm M 4 n ATTORNEY WITNESS:

R. H. STO KER. PUMP.

APPL'ICATION FILED MAR. 22.1921.

" 1,399,669. Patented Dec. 6, 1921. m

4 SHEETS-SHEET 3- ATTORNEY WITNNS:

R. H. STOKER.

PUMP.

APPLICATION FILED MAR. 22, I921.

Patented Dec. 6, 1921.

4 SHEETS-SHEET 4.

29012612 ff ii ATTORNEY WITNBS:

UNITED STATES.

PATENT OFFICE,

ROBERT HI. STOTKER, 0F HOUSTON, 'OIEIIIC).

essence.

To all whom it may concern:

Be it known that I, Bonner H. S'ronnn, a citizen of the United States, residing at Houston, in the county of Shelby and State of Ohio, have invented new and useful Improvements in Pumps, of which the followother eccentricto move said member in the op osite direction. a e e nether object of the invention is to provide the eccentrics with movable straps or bands and with means for connecting and disconnecting the straps or hands with the eccentrics in such a manner that when one {of the bands is 1n engagement with 1ts eccentric to give the reciprocating member one strokethe other band is free of its eccentrio so that said band and theconnecting parts'can rotate ion the eccentric to a position Where they. will be ready to rive the reciprocating member. its return stro lre after the completion of the first stroke.

.A. further object I: of the inventionis to provide automatically operating dogs for engaging and disengaging the bands or straps with their eccentrics.

This invention also 1 consists in certain other features of constructionand 1n the comb nation and arran ement of theseveral parts, tobe hereina ter fully. described,

7 c a sillustrated in .theaccompanying drawings and specifically pointed out the appended In describing my invention reference will be had to the accompanying drawings wherein like characters denote like or correspondin parts throughout the sev- I eral views, and 1nwhich:

.. Figure 1 is an elevation of the invention showing the samein use on a pump.

9 Fig. 2 is a view takenat right anglesto 3 is an enlargedview of one set of eccentrics andtheir associated parts.

Fig. this a section on line H of Fig, 3. .Fig. 5 is a fragmentary sectional view.

Specification of Letters Patent.

Application "filed March 22, 1921. Serial No. 454,553.

PUMP.

Patented Dec. 6, 1921 showing the operating mean for the dogs of one pair of eccentrics.

Fig. 6is a fragmentary sectional view showing the dog receiving recesses in one of the eccentrics and its strap with the dog in the recess in thestrap.

Fig. 7 is a diagrammatic View showing the parts in a position at the completion of thelifting stroke and the'beginning of the down stroke.

Fig. 8 is a similar view showing the position of thepartsat the beginning of the lifting stroke. v

In these views 1 indicates a rotatable shaft to which the two sets of eccentrics A. and B are secured. The sets comprise the small lifting eccentrics 2 and 2 and the large lowering eccentrics 3 and 3. The eccentrics of each set are connected together so as to move as one element and each eccentric is grooved to receive the straps or hands ft and a. Each eccentric is provided with a recess 5 and the recess of each large eccentric has its bottom wall provided with teeth 6. Each strap is provided with a recess 7. dog 8 is pivotally mounted in the recess Tin each strap 4: of the large eccentrics and a dog 8 is pivotally mounted in the recessof each small eccentric.

. eccentrics support the parts and permit them to lower gradually. r

i I provide trip means for lifting the dogs out of the recesses in the eccentrics to free the straps from the eccentrics and such means consists of a shaft 10 carried by each set of eccentrics and passing through the same adjacent the shaft 1. The openingfor said trip shaft 10 is in communication with the grooves for the stra s of both the large and small eccentrics an theportions of the shaft adjacent said grooves are toothed, as at 11. The opening for said. shaft 10 is also in communication with. the recesses 57in the lllt) eccentrics so that the toothed portions 11 of shaft 10 will engage the teeth 12 on the ends of'dogs 8 when said dogsare in the recesses 5 so that when said shaft is rotated said dogs will be lifted out of the recesses 5 into the recesses 7 in the straps. The outer end of the shaft 10 is provided with a toothed wheel 13which is adapted to engage with a pair of toothed segments 14 secured to the supporting frame of the device, these segments 1% being so arranged that they will causeshaft 10 to rotate to move the dog 8 of the large eccentric into the recess in the strap at the beginning of the up stroke of the device and to move dog 8 out of the recess 5 of the small eccentric at .t ie end of the lift stroke.

A forked pitman rod 15 connects each of the straps 4 of the large eccentrics with the pump rod and a flexible member l6'has its lower end connected with the cross head of the pump and its upper end connected with the strap 4 of each of the small eccentrics.

, These flexible members pass over the idlers 17 which are suitably supported on the supporting frame.

Fig. 1 shows the set of eccentrics A in a position with the small eccentric-engaged with'its strap and the large eccentric disengaged from its strap. Eccentric 2, at the start of its lifting stroke is off center, while eccentric 2 is carrying the load at full speed and is nearing the completion of the stroke.

-The strap ofthe large eccentric of set A will move anti-clockwise upon its eccentric as soon as the small eccentric of this set "starts to raise the pump piston. The set B will have reached the end of the stroke when they reach the line E-E. At this point the strap of the small eccentric of set B will be disengaged from its eccentric by the toothed wheel 13 engaging the top seg- E l) to the bottom of the stroke.

ment 14 and the strap of the large eccentric of set B will be engaged with its eccentric by its dog moving into the recess 5 so as to carry the pitman from the dotted line large eccentric forces the parts downwardly 1 the. flexible member will be unwound from the small eccentric causing the eccentric tion. As shown the dogs are placed near Therotary motion of the eccentric head produces a straight line reciprocating movement of the pump'pistons by the simple wlnding of the flexible members on the periphery of the'e'ccentric bands as they rotate,

the bands being engaged to the eccentrics when the upward-stroke is being made; and as the eccentrics are oppositely keyed 'to the As this ing at the beginning of the upward'stroke,

off of center at no speed, see Fig. 1. lit gradually increases in speed and assumes the load and has attained full speed at the instant the other stroke is completed. Consequently dead centers are positively eliminated, and the load being carried at all times on the same radius, the water column must travel at the same speed at all times, making pulsation in the discharge or flow impossible, as well as any jerk, jar, vibration, water hammer, back lash or any uneven strain or irregularity whatever. As the cocentric head rotates and the lifting eccentric raises its cross head with its rods and water load, the pitman rod, being connected to the cross head and to the eccentric band of the downstroke eccentric, must raise with it. In raising, it moves this eccentric hand back in the opposite direction to which the head is rotating, and when the u ward stroke is completed the point at whic the pitman rod is connected to the eccentric band will be in the same position on the eccentric as when starting at the beginning of the upward stroke. At the instant of the completion of the upward stroke, the band on the lifting eccentric is disengaged from the eccentric and the. band on the down stroke eccentric is simultaneously engaged to its eccentric, and travels with the eccentric carrying all the weight of pitman, cross head and pump rods back on the down stroke to the'be inning of the upward stroke. The flexible member connecting the cross head and the lifting eccentric 1s unwound as the cross head descends, drawing back in opposite direction from the rotation of the. head, the band ofthe lifting eccentric, to the same position as atthe beginning of the upward stroke. At this point in the revolution, the lifting eccentric band is engaged to the eccentric and the down stroke eccentric band p I is simultaneously disengaged from its ec- "strap to rotate in a counter clockwise d1reccentric. When the bands are moving on the eccentrics there is no load whatever on them, either on lifting or down stroke eccentrics. Consequently there is practically no friction and when carryingthe load, being engaged to their eccentrics, there can be no friction. While the drawings show the invention in use on a pump it willof course be under stood that it may be used on other devices such as well drilling machines, stamping mills and the like.

It is thought from the'foregoin description that the advantages and novl features of my invention will be readily apparent.

I desire it to be understood thatI may eeaeee tit make changes in the construction and in the parts, provided that such changes tall with in the scope oi the appended claims. What l: claim is z l. A device of the class described comprising a rotatable shaft, a set or eccentrics theremi including a small litting ec entric and a large downstroke eccentric, straps slidably engaging the eccentrics, a reciprocating member, means for connecting the saic member with the straps and means for engaging one strap with its eccentric and disengaging the other strap from its eccentric.

2. A device of the class described comprising a rotatable shaft, a pair of: eccentrics thereonconnected together and including a lifting eccentric and a downstroke eccentric, straps for the eccentrics slidably mounted thereon, a reciprocating member, a flexible member connecting the reciprocating member with the strap of the lifting eccentric, a pitman connecting the reciproeating member with the strap of the up stroke eccentric and means for engaging the strap of the lifting eccentric therewith and disengaging the strap oi? the downstroke eccentric therefrom for the upstroke and disengaging the strap of the lifting eccentric and engaging the strap or the downstroke eccentric therewith for the downstroke.

o. A device of the class described comprisg a rotatable shaft, a pair of reciprocat ing members, two sets of eccentrics on the rotatable shaft, each set consisting of a small lifting eccentric and a large downstroke eccentric, straps for the eccentrics rotatably mounted thereon, a flexible member connecting the strap of each lifting eccentric with a reciprocatingmember, a pitman connecting the strap of each down stroke eccentric with a reciprocating member, dogs for antomatically engaging the straps with the eccentrics and trip means for disengaging the dogs to free the straps from the eccentrics.

In testimony whereof I afiix my signature.

H. STOKER. 

